Alberti, Leone Battista, Architecture, 1755

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1Seventh; the Eighth was the Time they then
lived
in under the Emperors, and the Ninth
was
to come; and by theſe Prognoſticks they
thought
it no hard Matter to diſcover even the
Events
of future Ages.
They conjectured that
Rome ſhould come to be Miſtreſs of the World,
from
this Symptom, namely, becauſe a Man
born
on the Day of her Foundation became in
Time
her Maſter.
And this Man, I find, was
Numa: for Plutarch inſorms us, that on the
Nineteenth
of April, Rome was begun, and
Numa born. But the Spartans gloried in ha­
ving
no Walls at all about their City; for con­
fiding
in the Valour and Fortitude of their
Citizens
, they thought there was no Occaſion
for
any Fortification beſides good Laws.
The
Ægyptians and Perſians, on the contrary, en­
cloſed
their Cities with the ſtrongeſt Walls;
for
not to mention others, Nineveh and Semi­
ramis
made the Walls of their Towns ſo thick,
that
two Chariots might paſs upon the Top
abreaſt
, and ſo high, that they were above an
hundred
Cubits. Arrian relates that the Walls
of
Tyre were an hundred and Fifty Foot high.
Some again have not been ſatisfied with one
Wall
: The Carthaginians encloſed their City
with
Three; and Herodotus writes that Deioces
fortiſied
his Town of Ecbatana, though it
was
ſeated upon an Hill with Seven.
Now
as
it is certain that Walls are a very
powerful
Defence both of our Perſons and
Liberties
, when the Enemy happens to be
ſuperior
either in Number or Fortune, I can­
not
join in with thoſe who are for having their
City
quite naked without any Wall, neither
with
ſuch as ſeem to place all their Hopes of
Defence
in their Wallalone.
I agree with what
Plato obſerves, that every City ſtands con­
tinually
expoſed to the Danger of being brought
under
Subjection; ſince, whether it be owing
to
Nature or Cuſtom, neither publick Bodies
nor
private Perſons can ever ſet Bounds to their
inſatiable
Deſire of getting and poſſeſſing ſtill
more
and more; from which one Source
ariſes
all the Miſchiefs of War.
So that what
is
there to be ſaid againſt adding Security to
Security
, and Fortification to Fortification?
From what has been already ſaid, we may
conclude
that of all Cities, the moſt Capacious
is
the round One; and the moſt Secure, that
which
is encompaſſed with Walls broken here
and
there into Angles or Baſtions jutting out at
certain
Diſtances, as Tacitus inſorms us Jeru­
ſalem
was: Becauſe it is certain, the Enemy
cannot
come up to the Wall between two
Angles
jutting out, without expoſing them­
ſelves
to very great Danger; nor can their
military
Engines attack the Heads of thoſe
Angles
with any Hopes of Succeſs.
But,
however
, we ſhould be ſure to make uſe of all
the
natural Advantages that offer themſelves
for
the Security of our Town or Fortification;
as
we may obſerve the Ancients did, accor­
ding
to the Opportunity or Neceſſity of the
Situation
.
Thus Antium, an ancient City of
the
Latins, in order to embrace the Winding
of
the Shore, appears from the old Ruins
which
are left, to have been built of a very
great
Length. Cairo, upon the Nile, is ſaid
alſo
to be a very long City. Palimbrota, a
City
of India, belonging to the Graſii, as
Metaſthenes informs us, was ſixteen Miles long,
and
three broad, running along the Side of the
River
.
We read that the Walls of Babylon
were
ſquare; and thoſe of Memphis built in
Shape
of a D.
But whatever Shape is choſen
for
the Walls, Vegetius thinks it ſufficient for
Service
, if they are ſo broad, that two armed
Soldiers
poſted there for Defence, may eaſily
paſs
without being in one anothers Way; and
ſo
high, that they cannot be ſcaled with Lad­
ders
; and built ſo firm and ſtrong, as not to
yield
to the battering Rams and other En­
gines
.
The military Engines are of two Sorts;
one
Sort are thoſe which break and demoliſh
the
Wall by Battery; the other are ſuch as
attack
and undermine the Foundation, and ſo
bring
down the Superſtructure.
Now the
greateſt
Security againſt both theſe, is not ſo
much
a Wall as a good Ditch.
The Wall is
of
no Uſe in the laſt Caſe, unleſs its Founda­
tion
lies under Water, or upon a ſolid Rock.
The Ditch ought to be very broad and very deep;
for
then it will hinder the moveable Tortoiſe­
ſhell
, Towers, or other ſuch Machines from ap­
proaching
the Wall; and when the Founda­
tion
is under Water, or on a Rock, it will be in
vain
to think of undermining it.
It is a Diſ­
pute
among the military Men, whether it is
beſt
for the Ditch to be full of Water, or to
be
kept dry; but it is allow'd, that the firſt
Thing
to be conſulted is, which is moſt for
the
Health of the Inhabitants; and then ſome
ſay
thoſe Ditches are certainly beſt which are
ſo
contrived, that if by the Force of Battery
any
Part of the Wall is beaten into them, it
may
be ſoon removed, and the Ditch kept
clear
, that it may not be filled up, and ſo
make
a Path for the Enemy.

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